Dandy-roll.



P. S. SINCLAIR.

DANDY ROLL.

APPLICATION FILED NOV. 12. 1914.

Patented July 27, 1915.

WITNESSES: j %tm A TTORNE Y5 PETER S. SINCLAIR, OF HOLY OKE, MASSACHUSETTS.

DANDY-ROLL.

Specification of Letters Patent.

Patented July 2'7, 1915.

Application filed November 12, 1914.. Serial No. 871,689.

To all whom it may concern Be it known that 1, PETER S. SINCLAIR, a citizen of the United States of America, residing in the city of Holyoke, county of Hampden, and State of Massachusetts, have invented certain new and useful Improvements in Dandy-Rolls, of which the following is a specification.

This invention relates to dandy rolls such as are used in the paper making art to apply water marks to a web of paper pulp.

As is well known, dandy rolls are sieve rolls adapted to compress and compact a web of paper pulp passing thereunder. Such rolls are used extensively as a means of forming a water mark in paper, the mark being impressed in the sieve like periphery of the roll. Heretofore, by reason of the unitary structure of dandy rolls it has been necessary to provide a separate roll for each mark used. Hence, where many marks are employed, as is the case in most paper mills, the investment is considerable.

It is the object of this invention to provide a dandy roll which is partially collapsible. With such a structure, a cylindrical tube is employed which is formed of the usual Fourdrinier wires and has the mark formed therein in the ordinary way. It is, therefore, only necessary to provide in numbers or a plurality of the removable cylindrical sieves which are comparatively inexpensive. The expensive structure, the roll itself, need not be duplicated. Thus, by my invention a marked saving in water mark equipment may be made.

In the accompanying drawings wherein I show for the purposes of illustration a preferred embodiment of my invention: Figure 1 is a side elevational view of the dandy roll with the cylindrical sieve thereon. Certain portions of this view are broken away to reveal interior construction. Fig. 2 is an end View of the roll; Fig. 3 is an end view with the bearing plate removed, showing the collapsible structure of the roll; Fig. 4 is a view similar to Fig. 3 showing the roll collapsed to permit the removal of the cylindrical sieve; Fig. 5 is a detail View of a spreading means whereby the collapsible sections may be expanded against the inner surface of the cylindrical sieve.

Referring to the drawings in detail, 1 represents a cylidrical sieve formed of the usual Fourdrinier wires and having a mark indicated at 2 impressed thereon. It is to be noted that in the usual dandy roll construction this member 1 is permanently secured to the roll itself. In the structure illustrated, however, it is detachably secured in a manner to be described.

The frame of the dandy roll, in my invention comprises a plurality of semi-circular rings 3, which are arranged transversely to the axis of the roll in spaced relation, and other similar rings 4:. Each pair of semicircular rings comprising sections 3 and 4:

are hinged together at one extremity at 16 (see Fig. 3). The other extremities of each of the sections 3 and 4 are notched at 18 and 19, respectively, as clearly shown in Fig. 4. The rings 3 are connected together by rods 5 which are fastened thereto by any suitable means, such as soldering for example. The rings 4 are similarly connected by rods 5. These rods 5 and 5 serve to hold the ring sections in spaced relation and effectually brace the structure. Secured to the outer peripheral surface of the rings 3 are rods 6 and to the rings 4. are similar rods 6. These rods 6 and 6 are arranged axially of the roll and are disposed about the peripheral surface of the rings 3 and 4 in spaced relation. Thus a cage like structure is formed.

Supported upon and secured to the rods 6 are wires 7 which are bent into semi-circular form. These wires 7 are arranged in spaced relation axially and connect each of rods 6. Similarly formed wires 8 are secured to the rods 6. The latter, however, are arranged in staggered relation to the wires 7 as clearly shown in Fig. 1. These wires 7 and 8 also overlap at one extremity, as indicated at 7 and 8. The other extremities very nearly abut as shown in Fig. 3 at 17. The wires 7 and 8 form the supporting surface for the cylindrical sieve member 1 and, since the former are not connected one to the other, limited movement of the frame sections of the roll one to the other, is permitted.

A spreader 12 shown in detail in Fig. 5 is adapted to be inserted at each end of the roll to force the sections 3 and 4 apart and thereby grip the cylindrical sieve 1 to the wires 7. This spreader is formed with a pair of parallel V-shaped edges 13 which are adapted to engage the notches 18 and 19. One end of the member 12 is pointed at 14C to permit the entrance of the spreader into the notches l8 and 19, and a hole 15 is formed at the other end of the spreader 12 to permit the insertion of a hook whereby the former may be extracted from the roll at will.

The rings 3 and 4 at the end of the roll are provided with several outwardly projecting studs 9 whereby a bearing plate 10, bearing a shaft 11, may be secured to the roll as shown in Figs. 1 and 2.

Fig. 1 shows the roll in assembled condition. WVhen it is desired to use a diiferent mark than that shown on the member 1 the procedure is as follows: The bearing plates 10 are removed from each end of the roll and a hook is inserted in the hole 15 of the spreader 12 and the latter is extracted. The sections 3 and t then fall together and assume the positions shown in Fig. The cylindrical sieve 1. may then be readily removed and a new sieve, bearing a new mark, may then be placed over the sections 3 and i. A spreader 12 is then forced into the notches l8 and 19 at each end of the roll to spread the sections 3 and 4 against the sieve 1. The plates 10 are then replaced and the roll is ready for use. Thus, by my structure, I provide a collapsible and rotatable frame adapted to support a cylindrical sieve bearing a watermark. Such a structure is adapted to reduce the fixed investment in watermark equipment since the sieve only need be made in quantities.

It 1s recogmzed that many modifications may be made without departing from the prising a spreader inserted between the other free spaced ends of the frame section to expand said sections to grip said sieve member.

2. A. device for watermarking paper comprising, in combination, frame sections hinged together, a tubular sieve member thereon formed with a mark in its peripheral surface, said frame sections being movable inwardly to permit free insertion or removal of said sieve member, and means to expand said sections to grip said sieve memher.

'3'. A dandy roll for watermarking paper comprising a pair of substantially semi cylindrical frame members hinged together a tubular sieve member adapted to be placed over said members and having a mark impressed thereon, means to force said frame members into intimate contact with said tubular sieve, whereby it is secured to the frame sections, and means removably secured to the latter whereby the roll may be rotatably supported in a paper making machine.

4:. A dandy roll comprising in combination, a plurality of spaced rings, said rings being formed in sections. and hinged together, a cage like wire structure secured to the periphery of said rings, said structure being separable in the same plane as the ring sections, a tubular-sieve upon said cage like structure, means adapted to be inserted between the free ends of said rings to expand the latter and said cage like structure against said tubular sieve, and bearing plates removably secured to the end pair of ring sections whereby the entire structure may be rotated in apaper making machine.

PETER S. SINCLAIR.

Witnesses HARRY W. BOWEN,

E. HARTWELL.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, I). G. 

